And yes, there is such a thing, like a button, necessary if many circles are drawn from the same center, so as not to scroll a hole in the vatman.
Thank you unknown friend. Without sarcasm - from childhood (at drawing lessons), and until the end of work on the culman (because they were replaced by an autocad with unigraphics), I didn't even guess why in the cooking room this little shit, and only one.
Z is. I did not have to ask, because because of its apparent uselessness this "button" usually did not delay in the cooking room :D